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317 lines
12 KiB
C#
317 lines
12 KiB
C#
//! \file ImageMI4.cs
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//! \date Sun Jul 12 15:40:39 2015
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//! \brief ShiinaRio engine image format.
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//
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// Copyright (C) 2015 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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namespace GameRes.Formats.ShiinaRio
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{
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[Export(typeof(ImageFormat))]
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public class Mi4Format : ImageFormat
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{
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public override string Tag { get { return "MI4"; } }
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public override string Description { get { return "ShiinaRio image format"; } }
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public override uint Signature { get { return 0x3449414D; } } // 'MAI4'
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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file.Position = 8;
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uint width = file.ReadUInt32();
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uint height = file.ReadUInt32();
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return new ImageMetaData
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{
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Width = width,
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Height = height,
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BPP = 24,
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};
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}
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public override ImageData Read (IBinaryStream stream, ImageMetaData info)
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{
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var reader = new Reader (stream, (int)info.Width, (int)info.Height);
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try
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{
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reader.Unpack (MaiVersion.Second);
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}
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catch
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{
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reader.Unpack (MaiVersion.First);
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}
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return ImageData.Create (info, PixelFormats.Bgr24, null, reader.Data, reader.Stride);
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}
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public override void Write (Stream file, ImageData image)
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{
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throw new System.NotImplementedException ("Mi4Format.Write not implemented");
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}
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internal enum MaiVersion
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{
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First, Second
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}
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internal sealed class Reader
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{
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IBinaryStream m_input;
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byte[] m_output;
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int m_stride;
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public byte[] Data { get { return m_output; } }
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public int Stride { get { return m_stride; } }
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public Reader (IBinaryStream file, int width, int height)
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{
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m_input = file;
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m_stride = width * 3;
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m_output = new byte[m_stride*height];
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}
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public void Unpack (MaiVersion version = MaiVersion.First)
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{
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m_input.Position = 0x10;
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m_bit_count = 0;
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LoadBits();
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if (MaiVersion.First == version)
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UnpackV1();
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else
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UnpackV2();
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}
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int m_bit_count;
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uint m_bits;
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void LoadBits ()
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{
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for (int i = 0; i < 4; ++i)
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{
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int b = m_input.ReadByte();
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if (-1 == b)
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break;
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m_bits = (m_bits >> 8) | (uint)(b << 24);
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m_bit_count += 8;
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}
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}
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uint GetBit ()
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{
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uint bit = m_bits >> 31;
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m_bits <<= 1;
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if (0 == --m_bit_count)
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{
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LoadBits();
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}
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return bit;
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}
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uint GetBits (int count)
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{
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int avail_bits = Math.Min (count, m_bit_count);
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uint bits = m_bits >> (32 - avail_bits);
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m_bits <<= avail_bits;
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m_bit_count -= avail_bits;
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count -= avail_bits;
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if (0 == m_bit_count)
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{
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LoadBits();
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if (count > 0)
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{
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bits = bits << count | m_bits >> (32 - count);
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m_bits <<= count;
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m_bit_count -= count;
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}
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}
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return bits;
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}
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void UnpackV1 ()
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{
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int dst = 0;
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byte b = 0, g = 0, r = 0;
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while (dst < m_output.Length)
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{
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if (GetBit() == 0)
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{
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if (GetBit() != 0)
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{
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b = m_input.ReadUInt8();
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g = m_input.ReadUInt8();
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r = m_input.ReadUInt8();
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}
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else if (GetBit() != 0)
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{
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byte v = (byte)GetBits (2);
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if (3 == v)
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{
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b = m_output[dst - m_stride];
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g = m_output[dst - m_stride + 1];
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r = m_output[dst - m_stride + 2];
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}
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else
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{
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b += (byte)(v - 1);
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g += (byte)(GetBits(2) - 1);
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r += (byte)(GetBits(2) - 1);
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}
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}
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else if (GetBit() != 0)
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{
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byte v = (byte)(GetBits(3));
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if (7 == v)
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{
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b = m_output[dst - m_stride + 3];
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g = m_output[dst - m_stride + 4];
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r = m_output[dst - m_stride + 5];
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}
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else
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{
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b += (byte)(v - 3);
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g += (byte)(GetBits(3) - 3);
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r += (byte)(GetBits(3) - 3);
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}
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}
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else if (GetBit() != 0)
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{
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byte v = (byte)GetBits (4);
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if (0xF == v)
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{
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b = m_output[dst - m_stride - 3];
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g = m_output[dst - m_stride - 2];
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r = m_output[dst - m_stride - 1];
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}
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else
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{
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b += (byte)(v - 7);
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g += (byte)(GetBits(4) - 7);
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r += (byte)(GetBits(4) - 7);
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}
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}
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else
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{
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b += (byte)(GetBits(5) - 15);
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g += (byte)(GetBits(5) - 15);
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r += (byte)(GetBits(5) - 15);
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}
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}
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m_output[dst++] = b;
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m_output[dst++] = g;
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m_output[dst++] = r;
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}
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}
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void UnpackV2 ()
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{
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int dst = 0;
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byte b = 0, g = 0, r = 0;
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while (dst < m_output.Length)
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{
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if (GetBit() == 0)
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{
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if (GetBit() != 0)
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{
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if (m_input.PeekByte() != -1)
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{
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b = m_input.ReadUInt8();
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g = m_input.ReadUInt8();
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r = m_input.ReadUInt8();
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}
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}
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else if (GetBit() != 0)
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{
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byte v = (byte)(GetBits(2));
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if (3 == v)
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{
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b = m_output[dst - m_stride];
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g = m_output[dst - m_stride + 1];
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r = m_output[dst - m_stride + 2];
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}
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else
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{
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b += (byte)(v - 1);
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v = (byte)GetBits (2);
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if (3 == v)
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{
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if (GetBit() != 0)
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{
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b = m_output[dst - m_stride - 3];
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g = m_output[dst - m_stride - 2];
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r = m_output[dst - m_stride - 1];
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}
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else
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{
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b = m_output[dst - m_stride + 3];
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g = m_output[dst - m_stride + 4];
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r = m_output[dst - m_stride + 5];
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}
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}
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else
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{
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g += (byte)(v - 1);
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r += (byte)(GetBits(2) - 1);
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}
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}
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}
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else if (GetBit() != 0)
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{
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byte v = (byte)(GetBits(3));
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if (7 == v)
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{
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b = m_output[dst - m_stride];
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g = m_output[dst - m_stride + 1];
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r = m_output[dst - m_stride + 2];
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b += (byte)(GetBits(3) - 3);
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g += (byte)(GetBits(3) - 3);
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r += (byte)(GetBits(3) - 3);
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}
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else
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{
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b += (byte)(v - 3);
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g += (byte)(GetBits(3) - 3);
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r += (byte)(GetBits(3) - 3);
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}
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}
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else if (GetBit() != 0)
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{
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b += (byte)(GetBits(4) - 7);
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g += (byte)(GetBits(4) - 7);
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r += (byte)(GetBits(4) - 7);
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}
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else
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{
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b += (byte)(GetBits(5) - 15);
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g += (byte)(GetBits(5) - 15);
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r += (byte)(GetBits(5) - 15);
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}
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}
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m_output[dst++] = b;
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m_output[dst++] = g;
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m_output[dst++] = r;
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}
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}
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}
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}
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}
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